> Hi All, > > Can someone confirm that it is still implementation defined whether I/O > operations (Put, Get, 'Write, 'Read) are atomic, blocking, or subject to > Priority_Ceiling. In quick review of the manual & rational, I found the > following: ... You forgot 9.5.1(18): IO subprograms are "potentially blocking". (And thus cannot be called from a protected object.) Thus, the question about Priority_Ceiling is moot. Of course, that doesn't say whether they REALLY are blocking. Randy Brukardt.